Prepared for: Proceedings of The ACEE 1998 Summer Study
Report dated: August 31, 1998
Prepared by Proctor Engineering Group
Contributor: George Peterson, P.E.
Field monitoring identified four groups of ACs. A significant portion were sized or operated such that they would not benefit directly and proportionally to decreased thermal loads. Some occupants turn the AC off and leave for work. When they return home at the peak hour, they turn the AC on in an overheated house. Initially the AC runs continuously and would do so in spite of most load reduction measures.
Other ACs are off during the peak. They make no contribution to the peak and would be unaffected by peak reduction programs.
The characteristics of the four groups at peak are: A) Off. B) Cycling and responsive to decreased load or equipment efficiency improvements. C) Continuously on, but responsive to retrofits. D) Continuously on, unresponsive to load reductions and some efficiency improvements.
Load, occupant control, and AC characteristics of each group are discussed. The effect of load changes and AC efficiency changes on diversified peak are discussed for each group. Examples from field monitoring and aggregate proportions are presented. An integrated model of the effect on peak demand for various program measures is presented based on the proportion of each group type present in the connected load.
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